evelopment of a Spatio-temporal Contrast Sensitivity Test for Clinical Us

Author(s)

Costa, Marcelo Fernandes ^{[1, 2]} ; Henriques, Leonardo Dutra ^[1] ; Pinho, Otavio Correa ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Psicol, Dept Psicol Expt, Lab Visao, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Nucleo Neurociencias Aplicada, Sao Paulo - Brazil

• Document type: Journal article
• Source: JOURNAL OF OPHTHALMIC & VISION RESEARCH; v. 17, n. 1, p. 69-77, JAN-MAR 2022.
• Web of Science Citations: 0

Abstract

Purpose: We developed a contrast sensitivity test that considers an integrative approach of spatial and temporal frequencies to evaluate the psychophysical channels in processing two-dimensional stimulus for clinical use. Our new procedure provides a more efficient isolation of the magnocellular and parvocellular visual pathways supporting spatiotemporal contrast sensitivity processing. Methods: We evaluated 36 participants of both sexes aged 18-30 years with 20/20 or better best-corrected visual acuity. Two spatial frequencies (0.5 cycles per degree {[}cpd] and 10 cpd), being in one of the three temporal frequencies (0.5 cycle per second {[}cps], 7.5 cps, and 15 cps), were presented in a high-resolution gamma corrected monitor. A two-alternative forced-choice procedure was conducted, and the staircase method was used to calculate the contrast sensitivity. Reliability was assessed using a retest procedure within a month (+/- 5 days) under the same conditions. Results: Results showed statistical significance in 0.5 cpd and 10 cpd spatial frequencies for 0.5 cps (F = 77.36; p < 0.001), 7.5 cps (F = 778.37; p < 0.001), and 15 cps (F = 827.23; p < 0.001) with a very high (eta(2) = 0.89) effect size. No statistical differences were found between the first and second sessions for all spatial frequencies. For reliability, a significantly high correlation and high internal consistency were found in all spatiotemporal conditions. The limits were calculated for normality. Conclusion: We developed an approach to investigate the spatiotemporal integration of contrast sensitivity designed for clinical purposes. The relative contribution of the low spatial frequencies/high temporal frequencies and the high spatial frequencies/low temporal frequencies of the psychophysical channels can also be evaluated separately. (AU)

• FAPESP's process: 14/26818-2 - Development and implementation of visual evaluation methods: clinical applications and animal models
• Grantee: Dora Selma Fix Ventura
• Support Opportunities: Research Projects - Thematic Grants